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Educational guide, not an alert service: no live data. Always follow official instructions from JMA, your municipality, police, fire and staff. In an emergency, protect yourself first. Full disclaimer

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Japan alert decoder · レベル5氾濫特別警報

Level 5 Emergency Warning (Flood) · Level 5

Act now: protect yourself · official rules as of 2026-10-17

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Level 5Act now: protect yourself

レベル5氾濫特別警報

Level 5 Emergency Warning (Flood)

Black, Alert Level 5 equivalent: a disaster is probably already happening or imminent. Your life is in danger. Hazard: a named major river overflowing (the alert names the river). Level 5 for a river means it has already overflowed (old name: 氾濫発生情報).

What to do now

  1. Take the safest action you can right now; it may be too late to go to a shelter.
  2. If going outside is dangerous: go to an upper floor (flooding, storm surge) or a room on the side away from the slope (landslide).
  3. Evacuation should already have happened at Level 4; don't wait for Level 5.
  4. Stay away from riverbanks and land near the named river.
  • Japan's rule of thumb: evacuate by Level 4 (purple). Don't wait for Level 5.

Issued by: JMA with MLIT or the prefecture (river flood forecasts). Live status: JMA warnings map (English)JMA earthquake information (English)JMA tsunami information (English)

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Educational guide, not an alert service: no live data. Always follow official instructions from JMA, your municipality, police, fire and staff. In an emergency, protect yourself first.

Data as of 2026-10-17 from official JMA, Cabinet Office, Cabinet Secretariat (J-ALERT) and Ministry of the Environment pages, with official names from the JMA multilingual dictionary (2026-03-26). Not affiliated with JMA or any government agency.

Educational guide, not an alert service: no live data. Always follow official instructions from JMA, your municipality, police, fire and staff. In an emergency, protect yourself first. Data as of 2026-10-17 from official JMA, Cabinet Office, Cabinet Secretariat (J-ALERT) and Ministry of the Environment pages, with official names from the JMA multilingual dictionary (2026-03-26). Not affiliated with JMA or any government agency.